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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-9616
DTSTART:20260403T183000Z
DTEND:20260403T203000Z
DTSTAMP:20260417T090250Z
LAST-MODIFIED:20260325T173025Z
LOCATION:Sterling B343
SUMMARY:Design of Magnetic Shielding for a Wide Field of View Sounding
  Rocket Instrument\, Preliminary Exam\, Sophia Nowak
DESCRIPTION:Diffuse hot gas near 10^6 K emits almost entirely in X-ray
 s below 400 eV\, creating a dense forest of emission lines. In order t
 o disentangle the various elements and ionization states we require de
 tectors with an energy resolution better than 2 eV FWHM. We are develo
 ping a new sounding rocket payload equipped with an array of high-reso
 lution sensors. To get enough counts for a useful spectrum during the 
 ~250s flight\, the detector array will need >2.5^2 cm collecting area 
 and ~1 steradian field of view (FOV).<br>
\n<br>
\nTransition-edge sen
 sors (TES) and their superconducting quantum interference device (SQUI
 D) readouts are extremely sensitive to magnetic fields\, and need to b
 e well-shielded from changes in the ambient magnetic field. Primary ma
 gnetic field sources during flight are stray fields from the adiabatic
  demagnetization refrigerator (ADR) and the Earth’s magnetic field. 
 Other TES-based space missions\, like Athena and Micro-X\, only have t
 o accommodate the f-number of the converging beam from their telescope
  mirror\, which X-ray reflection physics limits to ~f/4. They can ther
 efore utilize long narrow cones of nested mu-metal and niobium in fron
 t of their detectors to improve shielding effectiveness. With our 1 sr
  direct FOV\, this would necessitate impractically large and long shie
 lds. Using COMSOL Multiphysics\, we explore a design which features a 
 Nb superconducting mesh closing the front of the shield close to the d
 etectors and enabling a much more compact shield.
URL:https://www.physics.wisc.edu/events/?id=9616
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